A Miniaturized 5.8 GHz L-Shaped Antenna Structure Modelled with Doubler-Multiplier Circuit Topologies
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محتوى المقالة الرئيسي
الملخص
This work reports the design and performance of two 5.8 GHz rectenna circuits for energy harvesting in implanted medical devices. The miniaturization technique used in the present work yields a compact L-shaped antenna of only 5 mm2, making it highly compatible with non-surgical implantation inside the human body. The fabrication and simulation data of the antenna are well-matched, with strong performance compared with the reported structure at a similar frequency band. A -20 dB measured reflection, and -14.6 dB simulated peak gain at 5.5 GHz were obtained. The modeling results indicate that the proposed rectenna based on the Cockcroft-Walton voltage doubler produced an output voltage of 0.83 V, corresponding to an RF-to-DC conversion efficiency of 0.14% at 0 dBm RF power. Before modelling procedure, all the passive elements utilized in the rectenna configuration were fabricated and tested. A variation in the load resistor revealed that a rectenna with an integrated Dickson voltage multiplier delivered an optimum output voltage and power of 1.25 V and 5.5 µW at a 0.25 MΩ load, respectively. The Dickson voltage multiplier achieved a 0.55% conversion efficiency, matching the reported figure of merit in the literature. At a higher efficiency of 0.8% with a relatively low load, the results demonstrate the proposed topology's potential as a good candidate for a miniaturized integrated rectenna geometry utilized in high-frequency energy harvesting systems.
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هذا العمل مرخص بموجب Creative Commons Attribution 4.0 International License.
THIS IS AN OPEN ACCESS ARTICLE UNDER THE CC BY LICENSE http://creativecommons.org/licenses/by/4.0/
كيفية الاقتباس
المراجع
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